Author: Thomas Jech
Title:A variation on a theorem of Galvin and Hajnal
Bull. London Math. Soc. 25 (1993)
Abstract: Using methods of Shelah's pcf theory, we prove an upper
bound on the length of cofinal scales
in reduced products, using the Galvin-Hajnal norm.

Authors: Thomas Jech and Saharon Shelah
Title:On a conjecture of Tarski on products of cardinals
Proceedings AMS 112 (1991)
Abstract: We look at an old conjecture of A. Tarski on
cardinal arithmetic and show that if a counterexample exists,
then there exists one of length omega_1 + omega.